JP6552181B2 - Liquid crystal display device and driving method thereof - Google Patents

Description

  The present invention relates to a liquid crystal display device and a method of driving the same.

  The liquid crystal display device is one of the most widely used flat panel display devices, and the arrangement of liquid crystal molecules is changed by applying different potentials to the pixel electrode and the common electrode of the liquid crystal display panel to form an electric field. Thus, the device expresses an image by adjusting the transmissivity.

  Deterioration occurs when an electric field in the same direction is continuously applied to the liquid crystal material. Therefore, in order to prevent this, it is common to perform driving that reverses the polarity of the voltage applied to the pixel electrode with respect to the voltage applied to the common electrode. It is. However, when the liquid crystal display device having a pixel composed of an even number of sub-pixels is driven in an inverted manner, a data voltage polarity bias phenomenon may occur.

  An object of the present invention is to provide a liquid crystal display device excellent in display quality and a method of driving the same.

  Another object of the present invention is to provide a polarity arrangement in which a polarity deviation of a data voltage does not occur in a liquid crystal display device having pixels composed of an even number of subpixels.

  According to an embodiment of the present invention, there is provided a liquid crystal display device comprising a plurality of gate lines arranged in a row direction, a plurality of data lines arranged in a column direction, the gate line, and the gate line. A plurality of sub-pixels each including a plurality of sub-pixels arranged in a matrix direction, each of which is connected to the data line and includes eight sub-pixels arranged in succession along the row. The polarity of the voltage applied to the adjacent subpixels is opposite from the first subpixel to the fourth subpixel, and the voltage applied to the adjacent subpixels also from the fifth subpixel to the eighth subpixel The polarities of voltages applied to the fourth sub-pixel and the fifth sub-pixel are the same.

  In the liquid crystal display device, polarities of voltages applied to the plurality of sub-pixels may be the same in the column direction.

  In the liquid crystal display device, polarities of voltages applied may be opposite every three sub-pixels in the column direction.

  Each data line may be connected only to the sub-pixel located on either the left side or the right side of itself.

  In the liquid crystal display device, an even number of subpixels may form one pixel, for example, four subpixels may form one pixel.

  In the liquid crystal display device, four subpixels respectively displaying four colors arranged in a specific order may be repeated in a matrix direction.

  A liquid crystal display according to another embodiment of the present invention is connected to a plurality of gate lines arranged in a row direction, a plurality of data lines arranged in a column direction, the gate line and the data line, respectively. A basic unit including four sub-pixels sequentially arranged along the row includes a plurality of sub-pixels arranged in the matrix direction. In the basic unit, the polarity of the applied voltage is opposite for every two sub-pixels along the row. Also, the subpixels in one of the two adjacent columns along the row have the same applied voltage polarity, and the subpixels in the other column have the polarity of the applied voltage between adjacent subpixels. Is the opposite.

  Each data line may be alternately connected one by one in the column direction to subpixels located on the left and right sides of the data line.

  A liquid crystal display according to another embodiment of the present invention is connected to a plurality of gate lines arranged in a row direction, a plurality of data lines arranged in a column direction, the gate line and the data line, respectively. And a plurality of sub-pixels in which a basic unit including eight sub-pixels arranged in series along a row is arranged in a matrix direction. In the basic unit, the polarities of voltages applied to adjacent subpixels in the first to fourth subpixels in the row direction are opposite to each other, and the polarities of voltages applied to adjacent subpixels in the fifth to eighth subpixels are also equal. On the contrary, the fourth subpixel and the fifth subpixel have the same polarity of applied voltage. Further, the subpixels of the first to third columns and the fifth to seventh columns in the column direction repeat units of three subpixels, and the polarity of the voltage applied to the adjacent subpixels in each repetition unit is opposite, The subpixels in the fourth and eighth columns have opposite polarities for every three subpixels.

  Each data line may be alternately connected one by one in the column direction to subpixels located on the left and right sides of the data line.

  A liquid crystal display according to another embodiment of the present invention includes a plurality of gate lines arranged in a row direction, a plurality of data lines arranged in a column direction, and the gate lines and the data lines, respectively. And a plurality of sub-pixels in which a basic unit including eight sub-pixels arranged in series along a row is arranged in a matrix direction. In the basic unit, the polarities of voltages applied to the first to fourth subpixels in the row direction are the same, and polarities of voltages applied to the fifth to eighth subpixels to the first to fourth subpixels are the same. Is the opposite. Also, in the column direction, the polarities of the voltages applied to the subpixels in the first to third and fifth to seventh columns are opposite to each other in every three subpixels, and the subpixels in the fourth and eighth columns are Three subpixels are used as a repeating unit, and the polarity of the voltage applied to the adjacent subpixel in each repeating unit is opposite.

  Each data line may be alternately connected one by one in the column direction to subpixels located on the left and right sides of the data line.

  A liquid crystal display according to another embodiment of the present invention is connected to a plurality of gate lines arranged in a row direction, a plurality of data lines arranged in a column direction, the gate line and the data line, respectively. And a plurality of sub-pixels in which a basic unit including four sub-pixels arranged in succession along a row is arranged in a matrix direction. In the basic unit, the polarity of the applied voltage is opposite for every two sub-pixels along the row. In addition, the subpixels in one of the two columns adjacent in the column direction have the same polarity of the applied voltage, and the subpixels in the other column have the polarity of the voltage applied to every two subpixels. Is the opposite.

  Each data line may be alternately connected to the subpixels located on the left side and the right side of the data line by two in the column direction.

  A liquid crystal display according to another embodiment of the present invention includes a plurality of gate lines arranged in a row direction, a plurality of data lines arranged in a column direction, and the gate lines and the data lines, respectively. And a plurality of sub-pixels in which a basic unit including six sub-pixels arranged in series along a row is arranged in a matrix direction. In the basic unit, polarities of voltages applied to every three sub-pixels along the row are opposite.

  Each data line may be alternately connected two by two in the column direction to subpixels located on the left and right sides of the data line.

  In the liquid crystal display device, polarities of voltages applied to every four subpixels in the column direction may be opposite.

  In the liquid crystal display device, the subpixels in two of the three columns adjacent in the column direction have the same polarity of the voltage applied in each column, and the subpixels in the other column have two subpixels. The polarity of the voltage applied to each subpixel may be opposite.

  In another aspect of the present invention, a liquid crystal display device including a plurality of sub-pixels connected to gate lines arranged in a row direction and data lines arranged in a column direction and arranged in a matrix direction is driven. A method is provided. In the above method, the data driver applies a data voltage of opposite polarity between adjacent gate lines to the data lines connected to the first to fourth sub-pixel columns to connect to the fifth to eighth sub-pixel columns. The data lines having the opposite polarity are also applied between adjacent gate lines, but the data lines connected to the fourth sub-pixel column and the data lines connected to the fifth sub-pixel column are the same. Apply a data voltage of the correct polarity.

  Each data line may be connected only to the sub-pixel located on either the left side or the right side of itself.

  The data driver may apply data voltages of the same polarity to each data line in one frame.

  The data driver may apply to each data line a data voltage having the opposite polarity for every three gate lines.

  In the case of the polarity arrangement according to the present invention, since the polarity deviation of the data voltage does not occur, it is natural that the ripple phenomenon of the common voltage does not occur, and there is no luminance difference in one frame or between frames. . Therefore, the display quality of the liquid crystal display device can be improved.

1 is a block diagram of a liquid crystal display device according to an embodiment of the present invention. FIG. 6 is an equivalent circuit diagram of one sub-pixel in a liquid crystal display according to an exemplary embodiment of the present invention. It is a figure which shows polarity arrangement | positioning and inversion drive of the liquid crystal display device by 1st Embodiment of this invention. FIG. 5 is a diagram showing the polarity arrangement and the inversion driving of the liquid crystal display according to the first embodiment of the present invention. It is a figure which shows polarity arrangement | positioning and inversion drive of the liquid crystal display device by 1st Embodiment of this invention. FIG. 5 is a diagram showing the polarity arrangement and the inversion driving of the liquid crystal display according to the first embodiment of the present invention. It is a figure which shows polarity arrangement | positioning and inversion drive of the liquid crystal display device by 1st Embodiment of this invention. FIG. 5 is a diagram showing the polarity arrangement and the inversion driving of the liquid crystal display according to the first embodiment of the present invention. FIG. 3 is a diagram illustrating an example of a data voltage applied to a data line in the liquid crystal display device according to the first embodiment of the present invention. FIG. 3 is a diagram illustrating an example of a data voltage applied to a data line in the liquid crystal display device according to the first embodiment of the present invention. FIG. 3 is a diagram illustrating an example of a data voltage applied to a data line in the liquid crystal display device according to the first embodiment of the present invention. It is a figure which shows polarity arrangement | positioning and inversion drive of the liquid crystal display device by 2nd Embodiment of this invention. It is a figure which shows polarity arrangement | positioning and inversion drive of the liquid crystal display device by 2nd Embodiment of this invention. FIG. 7 is a diagram showing polarity arrangement and inversion driving of a liquid crystal display according to a second embodiment of the present invention. It is a figure which shows polarity arrangement | positioning and inversion drive of the liquid crystal display device by 2nd Embodiment of this invention. It is a figure which shows polarity arrangement | positioning and inversion drive of the liquid crystal display device by 2nd Embodiment of this invention. FIG. 7 is a diagram showing polarity arrangement and inversion driving of a liquid crystal display according to a second embodiment of the present invention. It is a figure which shows the example of the data voltage applied to a data line with the liquid crystal display device by 2nd Embodiment of this invention. It is a figure which shows the example of the data voltage applied to a data line with the liquid crystal display device by 2nd Embodiment of this invention. It is a figure which shows the example of the data voltage applied to a data line with the liquid crystal display device by 2nd Embodiment of this invention. It is a figure which shows polarity arrangement | positioning of the liquid crystal display device by other embodiment of this invention. FIG. 7 is a diagram showing a polarity arrangement of a liquid crystal display according to another embodiment of the present invention. It is a figure which shows polarity arrangement | positioning of the liquid crystal display device by other embodiment of this invention. It is a figure which shows polarity arrangement | positioning of the liquid crystal display device by other embodiment of this invention. FIG. 7 is a diagram showing a polarity arrangement of a liquid crystal display according to another embodiment of the present invention. It is a figure which shows polarity arrangement | positioning of the liquid crystal display device by other embodiment of this invention. It is a figure which shows the polar arrangement | positioning of the liquid crystal display device in which the polarity bias of a data voltage arises. It is a figure which shows the example of the data voltage applied to a data line with the liquid crystal display device in which the polarity deviation of a data voltage occurs.

  The embodiments of the present invention will be described in detail with reference to the accompanying drawings so that those skilled in the art to which the present invention pertains can easily carry out the embodiments. However, the present invention can be realized in various forms and is not limited to the embodiments described here.

  A liquid crystal display device and a driving method thereof according to an embodiment of the present invention will be described in detail with reference to the drawings.

  First, a liquid crystal display device and a driving method thereof according to an embodiment of the present invention will be described with reference to FIGS.

  FIG. 1 is a block diagram of a liquid crystal display device according to an embodiment of the present invention, and FIG. 2 is an equivalent circuit diagram of one subpixel in the liquid crystal display device according to an embodiment of the present invention.

  As shown in FIG. 1, the liquid crystal display device 1 includes a liquid crystal display panel 300 that displays an image, a gate driver 400, a data driver 500, and a signal controller 600. Further, FIG. 1 shows a graphic processing unit 10 located outside the liquid crystal display device 1.

  The graphic processing unit 10 provides the video signals R, G, and B and the control signal CONT to the signal control unit 600 of the liquid crystal display device 1. The control signal CONT includes a horizontal synchronization signal Hsync, a vertical synchronization signal Vsync, a clock signal CLK, a data enable signal DE, and the like. The image signals R, G, and B and the control signal CONT may be transferred to the signal control unit 600 by, for example, low voltage differential signaling (LVDS).

  The liquid crystal display panel 300 includes lower and upper panels 100 and 200 facing each other and a liquid crystal layer 3 interposed therebetween. The liquid crystal display panel 300 includes a plurality of gate lines G1-Gn and a plurality of data lines D1-Dm. The plurality of gate lines G1-Gn are extended in a substantially horizontal (row) direction, and the plurality of data lines D1-Dm are insulated from the plurality of gate lines G1-Gn and extend in a substantially vertical (column) direction while intersecting. Has been.

  One gate line and one data line are connected to one sub-pixel sPX. Such subpixels may be arranged in a matrix, and each subpixel may include a thin film transistor Q, a liquid crystal capacitor Clc, and a storage capacitor Cst.

  A pixel (pixel) which is the minimum unit of an image (image) is composed of a plurality of sub-pixels to which luminance is independently assigned, and color and luminance can be displayed by a combination of sub-pixels. For example, one pixel may be composed of three sub-pixels that respectively represent the three primary colors of light, red, green, and blue. One pixel may be composed of an even number of sub-pixels. For example, it may be composed of four sub-pixels expressing red, green, blue and white, respectively. As another example, one pixel may be composed of two sub-pixels representing red R and green, or blue and green, respectively. Such a pixel is called a so-called pentile method.

  As shown in FIG. 2, the control terminal of the thin film transistor Q is connected to one gate line Gi, the input terminal of the thin film transistor Q is connected to one data line Dj, and the output terminal of the thin film transistor Q is one side terminal of the liquid crystal capacitor Clc. The pixel electrode 191 and the one side terminal of the storage capacitor Cst may be connected. The other terminal of the liquid crystal capacitor Clc may be connected to the common electrode 270, and the other terminal of the storage capacitor Cst may receive a sustain voltage. Depending on the type of the liquid crystal display panel 300, the pixel electrode 191 and the common electrode 270 may be formed so as to be positioned on the lower panel 100.

  The signal controller 600 receives input video signals R, G, and B and their control signals CONT, that is, a horizontal synchronization signal Hsync, a vertical synchronization signal Vsync, a clock signal CLK, a data enable signal DE, and the like from the external graphic processing unit 10. . The signal controller 600 processes the video signals R, G, and B so as to suit the operating conditions of the liquid crystal display panel 300 based on the video signals R, G, and B and the control signal CONT, and then processes the video data DAT and the gate control signal. CONT1, a data control signal CONT2, and a clock signal are generated and output.

  The gate control signal CONT1 includes a scan start signal (start pulse vertical signal) STV for instructing start of scanning and a clock signal (clock pulse vertical signal) CPV as a reference for generation of a gate on voltage (Von). The output period of the scan start signal STV corresponds to one frame or refresh rate. The gate control signal CONT1 may further include an output enable signal OE which limits the duration of the gate on voltage Von.

  The data control signal CONT2 is a horizontal start signal (start pulse horizontal signal) STH for instructing start of transmission of video data DAT to one row of sub-pixels, and a load signal TP for instructing application of the corresponding data voltage to the data lines D1-Dm. including. The data control signal CONT2 may further include an inversion signal REV that inverts the polarity of the data voltage with respect to the common voltage Vcom.

  The plurality of gate lines G1-Gn of the liquid crystal display panel 300 are connected to the gate driver 400, and the gate-on voltage Von is sequentially applied by the gate control signal CONT1 applied from the signal controller 600, and the gate-on voltage Von is applied. The gate-off voltage Voff is applied during the period when the operation is not performed.

  The plurality of data lines D1-Dm of the liquid crystal display panel 300 are connected to the data driver 500, and the data driver 500 receives the data control signal CONT2 and the video data DAT from the signal controller 600. The data driver 500 converts the image data DAT into data voltages using the gray scale voltages generated by the gray scale voltage generator (not shown), and transmits the data voltages to the data lines D1-Dm. The data voltage includes a data voltage of positive polarity and a data voltage of negative polarity based on the common voltage (hereinafter simply referred to as “positive data voltage” or “negative data voltage”). The positive data voltage and the negative data voltage are alternately applied based on frame and row and / or column to reverse drive. Thus, inversion driving is classified into frame inversion, column inversion, row inversion (or line inversion), dot inversion, etc., and such inversion may be realized complexly and more complicatedly. .

  3 to 8 are diagrams illustrating the polarity arrangement and inversion driving of the liquid crystal display device according to the first embodiment of the present invention.

  In the drawing, long vertical lines indicate data lines arranged substantially parallel to each other, and squares indicate sub-pixels. The short horizontal lines indicate the connection of data lines and sub-pixels. The positive (+) or negative (-) in the square indicates the polarity of the data voltage applied to each sub-pixel at a specific time (hereinafter referred to as “sub-pixel polarity”), and a, b, c and d indicate each Indicates the color expressed by the sub-pixel. Such a rule applies equally to the following drawings.

  First, as shown in FIG. 3 and FIG. 4, FIG. 3 shows the polar arrangement in the n-th frame of the liquid crystal display device, and FIG. 4 shows the polar arrangement in the n + 1-th frame. The colors of a, b, c and d, which are the colors represented by each sub-pixel, may all be different, and a pair of these colors may be identical (for example, the colors of a and c are identical) The two pairs of colors may be the same (for example, the colors of a and c are the same, and the colors of b and d are the same). On the other hand, four sub-pixels of a, b, c, and d colors may form one pixel, and two sub-pixels of a and b colors or two sub-pixels of c and d colors are one You may make a pixel. Hereinafter, the embodiments of the present invention will be described in detail by taking as an example the case where the colors of a, b, c and d are all different and four sub-pixels form one pixel.

  Each data line is all connected to the sub-pixel located on the right side. In some embodiments, each data line may be connected to a subpixel located on the left side of the data line, a data line may be connected to a subpixel located on the right side, and a data line may be connected to a subpixel located on the left side. May be connected.

  From the viewpoint of the data line, a positive (+) data voltage is applied to the first, third, sixth, and eighth data lines D1, D3, D6, and D8 in the nth frame, and the second, fourth, A negative (-) data voltage is applied to the fifth and seventh data lines D2, D4, D5 and D7. On the other hand, in the (n + 1) th frame, a negative (−) data voltage is applied to the first, third, sixth and eighth data lines D1, D3, D6 and D8, and the second, fourth, fifth and fifth data lines are applied. The positive (+) data voltage is applied to the seven data lines D2, D4, D5, and D7.

  As described above, the application of data voltages having different polarities depending on the data lines is repeated based on the eight data lines. That is, positive (+), negative (-), positive (+), negative (-), negative (-), positive (+), negative (-) and positive (+) from the left data line to each data line It is repeated that the data voltage of is applied. Therefore, the polarities of the data voltages applied to the first to eighth data lines D1-D8 are equally applied to the ninth to sixteenth data lines D9-D16. For the inversion driving according to the first embodiment, the data driving unit applies a data voltage whose polarity is inverted for each frame to each data line so as to match the aforementioned polarity.

  From the viewpoint of subpixels, the subpixels in the first to fourth columns are reversed in polarity between adjacent subpixels, and the subpixels in the fifth to eighth columns are also reversed in polarity between adjacent subpixels. The polarities of the subpixels in the fifth to eighth columns are opposite to those of the subpixels in the first to fourth columns. The first to eighth sub-pixel columns form a basic unit whose polarity is repeated, and are repeated in the row direction. That is, the polarities of the ninth to sixteenth subpixel columns are sequentially the same as the polarities of the first to eighth subpixel columns.

  When data voltages of predetermined levels are applied to the sub-pixels of all colors, the number of positive (+) sub-pixels and the number of negative (-) sub-pixels are the same for each color in the n-th frame. In addition, positive (+) sub-pixels and negative (-) sub-pixels are alternately arranged for each color in the row direction. For example, in two basic units, the a-color sub-pixels are located one by one for every four sub-pixels, and their polarities are from the left side positive (+), negative (-), positive (+) and negative (-) . Therefore, since the positive polarity and the negative polarity are evenly mixed, the display quality is not deteriorated due to a luminance difference that can exist between the polarities.

  In the (n + 1) th frame, as in the nth frame, the number of positive (+) subpixels and the number of negative (−) subpixels are the same for each color, and positive (+) for each color in the row direction. The subpixels and the negative (-) subpixels are alternately arranged. Accordingly, since there is no luminance difference between frames due to polarity inconsistency (for example, the luminance may vary depending on the polarity even when a data voltage of the same level is applied), flicker does not occur.

  On the other hand, the subpixels in each subpixel column are connected to the same data line. As a result, when sub-pixels of one sub-pixel column are connected to different data lines, the capacitance (Cgs) between the gate and the source of the thin film transistor that can be generated between the sub-pixels connected to different data lines. There is no difference in luminance due to the characteristic deviation.

  FIGS. 5 and 6 respectively show the polarity arrangement of the n-th frame and the n + 1-th frame in the case of displaying only one color. For example, when a is red, a red screen is displayed. The hatched subpixels in the drawings indicate a case where the data voltage of the lowest gradation is applied to the corresponding subpixels, and the same applies in the following drawings. Even if the polarities of the subpixels expressing red a are inverted in the nth frame and the n + 1th frame, the same number of positive (+) subpixels and negative (−) subpixels are alternately arranged in each frame. ing. Therefore, even when displaying a single color, no difference in luminance occurs between the frames.

  FIG. 7 and FIG. 8 respectively show the polarity arrangements of the nth frame and the (n + 1) th frame when displaying mixed colors. For example, when a, b, c and d are red, green, blue and white, respectively, to display cyan. Even if the polarities of the subpixels representing green b and blue c are inverted in the nth frame and the n + 1th frame, the positive (+) subpixel and the negative (−) subpixel are alternately the same in each frame. Arranged by number. Therefore, no luminance difference occurs between frames even when displaying mixed colors.

  FIGS. 9 to 11 are diagrams showing examples of data voltages applied to data lines in the liquid crystal display according to the first embodiment of the present invention.

  FIG. 9 shows the data voltage applied to the data line when applying the same data voltage, for example, the maximum gray scale voltage, to all the sub-pixels. In the drawing, one scale in the lateral direction indicates one horizontal period 1H. The voltage applied to the first data line D1 and the voltage applied to the second data line D2 have the same magnitude and opposite polarities. Such a relationship is the same for the pair of third and fourth data lines D3 and D4, the pair of fifth and sixth data lines D5 and D6, and the pair of seventh and eighth data lines D7 and D8. Thus, the data voltages are balanced in polarity, as the data voltages are applied to the data lines in a complementary manner (i.e., they are identical in magnitude and opposite in polarity). As a result, since the polarity of the data voltage is not biased to either one, the common voltage Vcom is not affected.

  In FIG. 10, the maximum gray scale voltage is applied only to the b-color (for example, green) sub-pixels, and the minimum gray scale voltage is applied to the remaining color sub-pixels to be applied to the data line when displaying a single color. Indicates the data voltage. As shown in FIG. 10, the voltages applied to the first and third data lines D1 and D3 and the data voltages applied to the fifth and seventh data lines D5 and D7 have the same magnitude. The polarity is opposite. The voltage applied to the second data line D2 is the same in magnitude as the voltage applied to the sixth data line D6, and is not only opposite in polarity, but also when one of the voltages rises. The voltage of one of the two falls (falling). Similarly, the voltage applied to the fourth data line D4 has the same magnitude as the voltage applied to the eighth data line D8, is opposite in polarity, and one of the other voltage increases. The voltage drops. Therefore, since the voltage is applied to the data line in a complementary manner and is applied so as to cancel the rise and fall of the voltage, the polarity of the data voltage is not biased to either one at the time of monochromatic display. Does not affect.

  In FIG. 11, the maximum gradation voltage is applied to b (for example, green) and c (for example, blue) subpixels, and the lowest gradation voltage is applied to the remaining subpixels (for example, blue) The data voltage applied to the data line when displaying (green) is shown. Voltages are applied to the first data line D1 and the fifth data line D5 in a manner complementary to each other and in an offset manner (ie, when one of the voltages rises, the other falls). Such a relationship is the same between the second and sixth data lines D2 and D6, between the third and seventh data lines D3 and D7, and between the fourth and eighth data lines D4 and D8. I understand. Therefore, the voltage is applied to the data lines in a complementary manner, and is applied so as to cancel the rise and fall of the voltage, so the data voltage is not biased to either one, so that the common voltage Vcom is also affected during mixed color display. Not give.

  12 to 17 are diagrams illustrating polarity arrangement and inversion driving of the liquid crystal display device according to the second embodiment of the present invention.

  FIG. 12 and FIG. 13 show the polar arrangements of the n-th frame and the n + 1-th frame, respectively, in the liquid crystal display device.

  In describing the second embodiment, the description of the technical features that are the same as those of the first embodiment will be simplified or omitted. As in the first embodiment described above, all the data lines are connected to sub-pixels located on the right side. Therefore, a luminance difference due to a characteristic deviation such as Cgs of a thin film transistor does not occur between subpixels. In some embodiments, each data line is connected to a subpixel located on the left side of the data line, or a data line is connected to a subpixel located only on the right side of the data line, and a data line is located only on the left side of the data line. It may be connected to the sub-pixel to be

  From the viewpoint of the data line, in the nth frame, the first, third, sixth and eighth data lines D1, D3, D6 and D8 have a positive (+) data voltage and a negative (− ) Is repeatedly applied, and the second, fourth, fifth, and seventh data lines D2, D4, D5, and D7 have a negative (−) data voltage and a positive (−) for every three subpixels. It repeats that the data voltage of +) is applied. That is, unlike the first embodiment, in the second embodiment, the data voltages of the same polarity are not applied to the corresponding data line over the entire one frame, but the polarity is inverted every three subpixels. Is applied as follows. For example, positive (+) data voltage is applied to the sub-pixels connected to the first to third gate lines of the corresponding data line, and negative (-) to the sub-pixels connected to the fourth to sixth gate lines. Data voltage is applied, and such inversion driving (so-called 3-line inversion driving) is repeated for the corresponding data line.

  In the (n + 1) th frame, the data voltage is applied opposite to the nth frame. That is, a negative (−) data voltage and a positive (+) data voltage are applied to the first, third, sixth, and eighth data lines D1, D3, D6, and D8 for every three subpixels. The positive (+) data voltage and the negative (−) data voltage are applied to the second, fourth, fifth, and seventh data lines D2, D4, D5, and D7 in the same manner for each of the three subpixels. To be repeated.

  As described above, the application of the data voltages of different polarities by the data lines and every three gate lines is repeated on the basis of the eight data lines. Therefore, the polarities of the data voltages applied to the first to eighth data lines D1-D8 are equally applied to the ninth to sixteenth data lines D9-D16. For the inversion driving according to the second embodiment, the data driver is inverted in polarity for each frame in each data line, and the polarity is inverted for every three gate lines in one frame. It may be applied to fit.

  From the viewpoint of subpixels, the subpixels in the first to fourth columns are reversed in polarity between adjacent subpixels, and the subpixels in the fifth to eighth columns are also reversed in polarity between adjacent subpixels. The polarities of the subpixels in the fifth to eighth columns are opposite to those of the subpixels in the first to fourth columns. The subpixels in the first to eighth columns are inverted in polarity every three subpixels in each column. The first to eighth sub-pixel columns form a basic unit and are repeated in the row direction. That is, the polarities of the ninth to sixteenth subpixel columns are sequentially the same as the polarities of the first to eighth subpixel columns.

  As in the first embodiment, when data voltages of predetermined levels are applied to sub-pixels of all colors, the n-th is of course the n + 1-th frame (thus, all frames), and positive (+) The number of pixels and the number of negative (-) sub-pixels are the same, and positive (+) sub-pixels and negative (-) sub-pixels are alternately arranged for each color in the row direction. Therefore, since the positive polarity and the negative polarity are mixed uniformly, the display quality does not deteriorate due to the luminance difference that can exist between the polarities, and the inter-frame luminance difference does not occur due to the polarity inconsistency.

  FIG. 14 and FIG. 15 respectively show the polarity arrangement of the n-th frame and the n + 1-th frame when only one color is displayed. For example, when a is red, even if the polarity of the subpixel representing red a is inverted between the nth frame and the n + 1th frame, the positive (+) subpixel and the negative (−) subpixel in each frame. Are alternately arranged in the same number. Therefore, no luminance difference occurs between frames even when displaying a single color.

  FIGS. 16 and 17 show the polar arrangements of the nth frame and the (n + 1) th frame, respectively, when displaying a mixed color. For example, if a, b, c, and d are red, green, blue, and white, respectively, the polarities of the sub-pixels that represent green (b) and blue (c) are inverted in the nth frame and the n + 1th frame, respectively. Even in each frame, positive (+) sub-pixels and negative (-) sub-pixels are alternately arranged in the same number. Therefore, no luminance difference occurs between frames when displaying mixed colors.

  FIGS. 18 to 20 illustrate examples of data voltages applied to data lines in a liquid crystal display according to a second embodiment of the present invention.

  FIG. 18 shows the data voltage applied to the data line when the same data voltage, for example, the maximum gradation voltage is applied to all the sub-pixels. The voltage applied to the first data line D1 and the voltage applied to the second data line D2 are the same in magnitude and opposite in polarity, and when one voltage rises, the other voltage falls. Therefore, the voltages applied to the first and second data lines D1 and D2 are complementary and offset. Similarly, the data voltages applied to the third and fourth data lines D3 and D4, the fifth and sixth data lines D5 and D6, and the seventh and eighth data lines D7 and D8, respectively, are complementary and offset. It is. Therefore, since the data voltage is not biased to either one, the common voltage Vcom is not affected.

  In FIG. 19, the maximum gray scale voltage is applied only to the a-color (for example, red) sub-pixel, and the minimum gray scale voltage is applied to the remaining color sub-pixel to be applied to the data line Indicates data voltage. As shown in FIG. 19, the first and fifth data lines D1, D5, the second and sixth data lines D2, D6, the third and seventh data lines D3, D7, and the fourth and eighth data. A data voltage is applied to each pair of lines D4 and D8 in a complementary and destructive manner. Therefore, the data voltage is balanced to either one at the time of monochromatic display.

  In FIG. 20, the maximum gray scale voltage is applied to the b color (for example, green) and c color (for example, blue) subpixels, and the minimum gray scale voltage is applied to the remaining color subpixels (for example, blue) The data voltage applied to the data line when displaying (green) is shown. Data voltages are applied to the first and eighth data lines D1 and D8 and the fourth and fifth data lines D4 and D5 in a complementary and destructive manner. In addition, data voltages are applied to the second and seventh data lines D2 and D7 and the third and sixth data lines D3 and D6 in a complementary and destructive manner. Therefore, since the data voltage is not biased to either one, the common voltage Vcom is not affected even when displaying mixed colors.

  FIGS. 21 to 26 are diagrams showing a polar arrangement of a liquid crystal display according to another embodiment of the present invention.

  FIG. 21 shows a polarity arrangement according to the third embodiment of the present invention. Each data line is alternately connected one by one to the subpixels located on the right and left sides. In a certain frame (for example, the nth frame), a positive (+) data voltage is applied to the first and second data lines D1 and D2, and a negative (-) is applied to the third and fourth data lines D3 and D4. The data voltage is applied. Such application of data voltages is repeated in the row direction with four data lines as basic units. Therefore, the data voltage having the polarity applied to the first to fourth data lines D1-D4 is applied to the fifth to eighth data lines D5-D8.

  Since the data lines are alternately connected to the subpixels located on the right and left sides thereof, a positive (+) voltage is applied to all the subpixels in the first column and all the subpixels in the third column are negative. Although a voltage of (-) is applied, positive (+) and negative (-) voltages are alternately applied to the second row of sub-pixels, and negative (-) and positive of the fourth row of sub-pixels The voltage of (+) is applied alternately. In the next frame, a voltage having a polarity different from that applied to the current frame is applied to each data line, and the polarity of each subpixel is also inverted.

  FIG. 22 shows a polarity arrangement according to the fourth embodiment of the present invention. Each data line is alternately connected one by one to the subpixels located on the right and left sides. In one frame, the first, third, sixth, and eighth data lines D1, D3, D6, and D8 have a positive (+) data voltage and a negative (−) data voltage alternately every three sub-pixels. Applied to the second, fourth, fifth, and seventh data lines D2, D4, D5, and D7, a negative (−) data voltage and a positive (+) data voltage are alternately applied to every three sub-pixels. Is done. The application of such data voltages is repeated in the row direction with eight data lines as a basic unit, and the polarity of the data voltages applied to each data line is inverted every frame.

  Since the data lines are alternately connected to the subpixels located on the right and left sides thereof, the subpixels in the first to third columns and the fifth to seventh columns have three subpixels as repeating units, and each repeating unit The polarity is inverted between adjacent subpixels, but the polarity of the subpixels in the fourth and eighth columns is inverted every three subpixels.

  FIG. 23 shows a polarity arrangement according to the fifth embodiment of the present invention. Each data line is alternately connected one by one to the subpixels located on the right and left sides. In one frame, positive (+) data voltage and negative (−) data voltage are alternately applied to the first to fourth data lines D1 to D4 for every three sub-pixels, and the fifth to eighth data lines. A negative (−) data voltage and a positive (+) data voltage are alternately applied to D5-D8 every three subpixels. The application of such data voltages is repeated in the row direction with eight data lines as a basic unit and is inverted every frame.

  Since the data lines are alternately connected to the subpixels located on the right and left sides, the subpixels in the first to third columns and the fifth to seventh columns are inverted in polarity every three subpixels. The subpixels in the fourth and eighth columns are inverted in polarity between adjacent subpixels in each repeating unit, with three subpixels as repeating units.

  In the polarity arrangement according to the third to fifth embodiments, the number of positive (+) sub-pixels and the number of negative (-) sub-pixels are the same for each color, and positive (+) for each color in the row direction. The subpixels and the negative (-) subpixels are alternately arranged. Also, when displaying white, single color, or mixed color, voltages are complementarily applied to the data lines in an offset manner. Therefore, there is no common voltage ripple due to luminance difference or polarity bias due to polarity mismatch.

  FIG. 24 shows a polarity arrangement according to the sixth embodiment of the present invention. Each data line is alternately connected to the subpixels located on the right side and the left side of the data line. In a certain frame, a positive (+) data voltage is applied to the first and second data lines D1 and D2, and a negative (−) data line is applied to the third and fourth data lines D3 and D4. . Such application of data voltages is repeated in the row direction with four data lines as basic units.

  In the inversion driving as described above, since the data lines are alternately connected to the subpixels located on the right side and the left side thereof, a positive (+) voltage is applied to all the subpixels in the first column, Negative (-) voltages are applied to all the subpixels in the third column, but positive (+) and negative (-) voltages are applied alternately to the subpixels in the second column every two subpixels Then, negative (−) and positive (+) voltages are alternately applied to the subpixels in the fourth column every two subpixels. In the next frame, a voltage having a polarity different from that applied to the current frame is applied to each data line, and the polarity of each subpixel is also inverted.

  FIG. 25 shows a polarity arrangement according to the seventh embodiment of the present invention. Each data line is alternately connected to the subpixels located on the right and left sides of the data line. In one frame, positive (+) data voltages and negative (-) data voltages are alternately applied to the first to third data lines D1-D3 every four sub-pixels, and the fourth to sixth data lines A negative (−) data voltage and a positive (+) data voltage are alternately applied to D4-D6 every four subpixels. Such application of the data voltage is repeated in the row direction using six data lines as a basic unit, and is inverted every frame. The subpixels of each column are inverted in polarity every four subpixels, but the subpixels of the third and sixth columns are inverted at a cycle different from that of the subpixels of the other columns.

  FIG. 26 shows a polarity arrangement according to the eighth embodiment of the present invention. Each data line is alternately connected to the subpixels located on the right side and the left side of the data line. In a certain frame, a positive (+) data voltage is applied to the first to third data lines D1-D3, and a negative (-) data voltage is applied to the fourth to sixth data lines D4-D6. . The application of such data voltages is repeated in the row direction with six data lines as basic units. As a result, a positive (+) data voltage is applied to the first and second row sub-pixels, and a negative (-) data voltage is applied to the fourth and fifth row sub-pixels. A positive (+) data voltage and a negative (−) data voltage are alternately applied to every two sub-pixels, and negative (−) every two sub-pixels. ) Data voltage and positive (+) data voltage are alternately applied. In the next frame, data voltages of different polarities are applied to the respective sub-pixels.

  In the polarity arrangement according to the sixth to eighth embodiments, there are rows in which positive (+) sub-pixels and negative (-) sub-pixels showing the same color are not alternately arranged, but positive (+) for each color The number of sub-pixels and the number of negative (−) sub-pixels are the same and balance is achieved overall. Also, when displaying white, single color, or mixed color, voltages are complementarily applied to the data lines in an offset manner. Therefore, a luminance difference due to polarity inconsistency does not substantially occur, and a common voltage ripple due to polarity bias does not occur.

  27 and 28 are diagrams showing examples of the polarity arrangement of the liquid crystal display device in which the polarity deviation of the data voltage occurs and the data voltage applied to the data line.

  As shown in FIG. 27, each data line is connected only to the sub-pixel located on the right side thereof. In one frame, positive (+) data voltages are applied to the first and fourth data lines, and negative (-) data voltages are applied to the second and third data lines. The application of such data voltages is repeated in the row direction with six data lines as a basic unit and is inverted frame by frame.

  In such a polarity arrangement, ripples may occur in the common voltage due to the polarity deviation. For example, in FIG. 28, in order to display mixed colors in the sub-pixel arrangement structure of FIG. 27, the lowest gradation voltage is applied to the a and d sub-pixels, and the maximum gradation voltage is applied to the b and c colors. Is illustrated. As shown in FIG. 28, not only the voltage applied to a certain data line is not complementary, but when the voltage of one data line rises, the voltage of the remaining data lines also rises, and one data When the line voltage decreases, the remaining data line voltage also decreases. As a result, a polarity deviation of the data voltage occurs, and as a result, a ripple phenomenon in which the common voltage is swayed by the polarity deviation may occur. This can lead to poor image quality. In the case of the polarity arrangement according to the embodiment of the present invention, the common voltage ripple phenomenon and the image quality defect due to the polarity deviation do not occur.

  Although the preferred embodiments of the present invention have been described above in detail, the scope of rights of the present invention is not limited thereto, and ordinary techniques using the basic concept of the present invention defined in the following claims. It should be understood that various modifications and improvements of the person skilled in the art are also within the scope of the present invention.

1: liquid crystal display device 3: liquid crystal layer 100: lower panel 200: upper panel 300: liquid crystal display panel 400: gate driver 500: data driver 600: signal controller D1-Dm: data line G1-Gn: gate line

Claims (9)

A plurality of gate lines arranged in a row direction,
Multiple data lines arranged in column direction,
A plurality of subpixels, each of which is connected to the gate line and the data line and includes eight subpixels arranged continuously along a row and arranged in a matrix direction;
In the basic unit, the polarity of the data voltage applied to the adjacent subpixel is opposite from the first subpixel to the fourth subpixel along the row, and from the fifth subpixel to the eighth subpixel. also adjacent Although the polarity of the data voltages applied to the sub-pixels is opposite the polarity of the data voltage applied to the fourth subpixel and the fifth subpixel are the same,
The polarities of data voltages applied to the plurality of sub-pixels are the same in the column direction,
The liquid crystal display device, wherein the subpixels adjacent in the column direction display different colors . 2. The liquid crystal display device according to claim 1 , wherein each data line is connected only to a sub-pixel located on one of the left side and the right side of the data line. 3. The liquid crystal display device according to claim 2 , wherein an even number of subpixels constitute one pixel. 4. The liquid crystal display device according to claim 3 , wherein four sub-pixels form one pixel. The liquid crystal display device according to claim 4, characterized in that the four sub-pixels for displaying each of the four colors arranged in a certain order are repeated in a matrix direction. A plurality of gate lines arranged in a row direction,
Multiple data lines arranged in column direction,
A plurality of subpixels, each of which is connected to the gate line and the data line and includes eight subpixels arranged continuously along a row and arranged in a matrix direction;
In the basic unit, the polarity of the data voltage applied to the adjacent subpixel is opposite from the first subpixel to the fourth subpixel along the row, and from the fifth subpixel to the eighth subpixel. The polarity of the data voltage applied to the adjacent subpixel is also opposite, but the polarity of the data voltage applied to the fourth subpixel and the fifth subpixel is the same,
The polarity of the data voltage applied to the sub-pixels is inverted every three sub-pixels in the column direction ,
What is claimed is: 1. A liquid crystal display device, wherein subpixels adjacent in a column direction display different colors . 7. The liquid crystal display device according to claim 6 , wherein each data line is connected only to a sub-pixel located on either the left side or the right side of the data line. 8. The liquid crystal display device according to claim 7 , wherein an even number of subpixels form one pixel. 9. The liquid crystal display device according to claim 8 , wherein four sub-pixels constitute one pixel.

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